A study shows harm in short-term exposures and proposes a particulate threshold that could influence air quality alerts.

Tens of thousands of emails poured into Southern California's top air pollution authority as its board weighed a June ...

Philadelphia launched a new tool that allows residents to monitor air quality and pollution in their neighborhoods in real time. On Wednesday, Feb. 18, Mayor Cherelle Parker and the Philadelphia ...

The city has installed 76 sensors to track levels of particulate matter and nitrogen dioxide — pollutants that aggravate ...